CVE-2024-26960
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-26960
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26960.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-26960
- Downstream
- Related
- Published
- 2024-05-01T05:19:12Z
- Modified
- 2025-10-14T15:04:48.153617Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- mm: swap: fix race between free_swap_and_cache() and swapoff()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mm: swap: fix race between freeswapand_cache() and swapoff()
There was previously a theoretical window where swapoff() could run and teardown a swapinfostruct while a call to freeswapandcache() was running in another thread. This could cause, amongst other bad possibilities, swappagetranshugeswapped() (called by freeswapandcache()) to access the freed memory for swap_map.
This is a theoretical problem and I haven't been able to provoke it from a test case. But there has been agreement based on code review that this is possible (see link below).
Fix it by using getswapdevice()/putswapdevice(), which will stall swapoff(). There was an extra check in swapinfoget() to confirm that the swap entry was not free. This isn't present in getswapdevice() because it doesn't make sense in general due to the race between getting the reference and swapoff. So I've added an equivalent check directly in freeswapandcache().
Details of how to provoke one possible issue (thanks to David Hildenbrand for deriving this):
--8<-----
_swapentryfree() might be the last user and result in "count == SWAPHAS_CACHE".
swapoff->trytounuse() will stop as soon as soon as si->inuse_pages==0.
So the question is: could someone reclaim the folio and turn si->inusepages==0, before we completed swappagetranshuge_swapped().
Imagine the following: 2 MiB folio in the swapcache. Only 2 subpages are still references by swap entries.
Process 1 still references subpage 0 via swap entry. Process 2 still references subpage 1 via swap entry.
Process 1 quits. Calls freeswapandcache(). -> count == SWAPHAS_CACHE [then, preempted in the hypervisor etc.]
Process 2 quits. Calls freeswapandcache(). -> count == SWAPHAS_CACHE
Process 2 goes ahead, passes swappagetranshugeswapped(), and calls _trytoreclaimswap().
_trytoreclaimswap()->foliofreeswap()->deletefromswapcache()-> putswapfolio()->freeswapslot()->swapcachefreeentries()-> swapentryfree()->swaprangefree()-> ... WRITEONCE(si->inusepages, si->inusepages - nr_entries);
What stops swapoff to succeed after process 2 reclaimed the swap cache but before process1 finished its call to swappagetranshugeswapped()?
--8<-----
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a
- https://git.kernel.org/stable/c/1ede7f1d7eed1738d1b9333fd1e152ccb450b86a
- https://git.kernel.org/stable/c/2da5568ee222ce0541bfe446a07998f92ed1643e
- https://git.kernel.org/stable/c/363d17e7f7907c8e27a9e86968af0eaa2301787b
- https://git.kernel.org/stable/c/3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39
- https://git.kernel.org/stable/c/82b1c07a0af603e3c47b906c8e991dc96f01688e
- https://git.kernel.org/stable/c/d85c11c97ecf92d47a4b29e3faca714dc1f18d0d
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixedd85c11c97ecf92d47a4b29e3faca714dc1f18d0d
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed2da5568ee222ce0541bfe446a07998f92ed1643e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed1ede7f1d7eed1738d1b9333fd1e152ccb450b86a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed363d17e7f7907c8e27a9e86968af0eaa2301787b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7c00bafee87c7bac7ed9eced7c161f8e5332cb4eFixed82b1c07a0af603e3c47b906c8e991dc96f01688e
Affected versions
v4.*
v4.11
v4.11-rc1
v4.11-rc2
v4.11-rc3
v4.11-rc4
v4.11-rc5
v4.11-rc6
v4.11-rc7
v4.11-rc8
v4.12
v4.12-rc1
v4.12-rc2
v4.12-rc3
v4.12-rc4
v4.12-rc5
v4.12-rc6
v4.12-rc7
v4.13
v4.13-rc1
v4.13-rc2
v4.13-rc3
v4.13-rc4
v4.13-rc5
v4.13-rc6
v4.13-rc7
v4.14
v4.14-rc1
v4.14-rc2
v4.14-rc3
v4.14-rc4
v4.14-rc5
v4.14-rc6
v4.14-rc7
v4.14-rc8
v4.15
v4.15-rc1
v4.15-rc2
v4.15-rc3
v4.15-rc4
v4.15-rc5
v4.15-rc6
v4.15-rc7
v4.15-rc8
v4.15-rc9
v4.16
v4.16-rc1
v4.16-rc2
v4.16-rc3
v4.16-rc4
v4.16-rc5
v4.16-rc6
v4.16-rc7
v4.17
v4.17-rc1
v4.17-rc2
v4.17-rc3
v4.17-rc4
v4.17-rc5
v4.17-rc6
v4.17-rc7
v4.18
v4.18-rc1
v4.18-rc2
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8
v4.19
v4.19-rc1
v4.19-rc2
v4.19-rc3
v4.19-rc4
v4.19-rc5
v4.19-rc6
v4.19-rc7
v4.19-rc8
v4.20
v4.20-rc1
v4.20-rc2
v4.20-rc3
v4.20-rc4
v4.20-rc5
v4.20-rc6
v4.20-rc7
v5.*
v5.0
v5.0-rc1
v5.0-rc2
v5.0-rc3
v5.0-rc4
v5.0-rc5
v5.0-rc6
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.10.1
v5.10.10
v5.10.100
v5.10.101
v5.10.102
v5.10.103
v5.10.104
v5.10.105
v5.10.106
v5.10.107
v5.10.108
v5.10.109
v5.10.11
v5.10.110
v5.10.111
v5.10.112
v5.10.113
v5.10.114
v5.10.115
v5.10.116
v5.10.117
v5.10.118
v5.10.119
v5.10.12
v5.10.120
v5.10.121
v5.10.122
v5.10.123
v5.10.124
v5.10.125
v5.10.126
v5.10.127
v5.10.128
v5.10.129
v5.10.13
v5.10.130
v5.10.131
v5.10.132
v5.10.133
v5.10.134
v5.10.135
v5.10.136
v5.10.137
v5.10.138
v5.10.139
v5.10.14
v5.10.140
v5.10.141
v5.10.142
v5.10.143
v5.10.144
v5.10.145
v5.10.146
v5.10.147
v5.10.148
v5.10.149
v5.10.15
v5.10.150
v5.10.151
v5.10.152
v5.10.153
v5.10.154
v5.10.155
v5.10.156
v5.10.157
v5.10.158
v5.10.159
v5.10.16
v5.10.160
v5.10.161
v5.10.162
v5.10.163
v5.10.164
v5.10.165
v5.10.166
v5.10.167
v5.10.168
v5.10.169
v5.10.17
v5.10.170
v5.10.171
v5.10.172
v5.10.173
v5.10.174
v5.10.175
v5.10.176
v5.10.177
v5.10.178
v5.10.179
v5.10.18
v5.10.180
v5.10.181
v5.10.182
v5.10.183
v5.10.184
v5.10.185
v5.10.186
v5.10.187
v5.10.188
v5.10.189
v5.10.19
v5.10.190
v5.10.191
v5.10.192
v5.10.193
v5.10.194
v5.10.195
v5.10.196
v5.10.197
v5.10.198
v5.10.199
v5.10.2
v5.10.20
v5.10.200
v5.10.201
v5.10.202
v5.10.203
v5.10.204
v5.10.205
v5.10.206
v5.10.207
v5.10.208
v5.10.209
v5.10.21
v5.10.210
v5.10.211
v5.10.212
v5.10.213
v5.10.214
v5.10.22
v5.10.23
v5.10.24
v5.10.25
v5.10.26
v5.10.27
v5.10.28
v5.10.29
v5.10.3
v5.10.30
v5.10.31
v5.10.32
v5.10.33
v5.10.34
v5.10.35
v5.10.36
v5.10.37
v5.10.38
v5.10.39
v5.10.4
v5.10.40
v5.10.41
v5.10.42
v5.10.43
v5.10.44
v5.10.45
v5.10.46
v5.10.47
v5.10.48
v5.10.49
v5.10.5
v5.10.50
v5.10.51
v5.10.52
v5.10.53
v5.10.54
v5.10.55
v5.10.56
v5.10.57
v5.10.58
v5.10.59
v5.10.6
v5.10.60
v5.10.61
v5.10.62
v5.10.63
v5.10.64
v5.10.65
v5.10.66
v5.10.67
v5.10.68
v5.10.69
v5.10.7
v5.10.70
v5.10.71
v5.10.72
v5.10.73
v5.10.74
v5.10.75
v5.10.76
v5.10.77
v5.10.78
v5.10.79
v5.10.8
v5.10.80
v5.10.81
v5.10.82
v5.10.83
v5.10.84
v5.10.85
v5.10.86
v5.10.87
v5.10.88
v5.10.89
v5.10.9
v5.10.90
v5.10.91
v5.10.92
v5.10.93
v5.10.94
v5.10.95
v5.10.96
v5.10.97
v5.10.98
v5.10.99
v5.11
v5.11-rc1
v5.11-rc2
v5.11-rc3
v5.11-rc4
v5.11-rc5
v5.11-rc6
v5.11-rc7
v5.12
v5.12-rc1
v5.12-rc1-dontuse
v5.12-rc2
v5.12-rc3
v5.12-rc4
v5.12-rc5
v5.12-rc6
v5.12-rc7
v5.12-rc8
v5.13
v5.13-rc1
v5.13-rc2
v5.13-rc3
v5.13-rc4
v5.13-rc5
v5.13-rc6
v5.13-rc7
v5.14
v5.14-rc1
v5.14-rc2
v5.14-rc3
v5.14-rc4
v5.14-rc5
v5.14-rc6
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.15.1
v5.15.10
v5.15.100
v5.15.101
v5.15.102
v5.15.103
v5.15.104
v5.15.105
v5.15.106
v5.15.107
v5.15.108
v5.15.109
v5.15.11
v5.15.110
v5.15.111
v5.15.112
v5.15.113
v5.15.114
v5.15.115
v5.15.116
v5.15.117
v5.15.118
v5.15.119
v5.15.12
v5.15.120
v5.15.121
v5.15.122
v5.15.123
v5.15.124
v5.15.125
v5.15.126
v5.15.127
v5.15.128
v5.15.129
v5.15.13
v5.15.130
v5.15.131
v5.15.132
v5.15.133
v5.15.134
v5.15.135
v5.15.136
v5.15.137
v5.15.138
v5.15.139
v5.15.14
v5.15.140
v5.15.141
v5.15.142
v5.15.143
v5.15.144
v5.15.145
v5.15.146
v5.15.147
v5.15.148
v5.15.149
v5.15.15
v5.15.150
v5.15.151
v5.15.152
v5.15.153
v5.15.16
v5.15.17
v5.15.18
v5.15.19
v5.15.2
v5.15.20
v5.15.21
v5.15.22
v5.15.23
v5.15.24
v5.15.25
v5.15.26
v5.15.27
v5.15.28
v5.15.29
v5.15.3
v5.15.30
v5.15.31
v5.15.32
v5.15.33
v5.15.34
v5.15.35
v5.15.36
v5.15.37
v5.15.38
v5.15.39
v5.15.4
v5.15.40
v5.15.41
v5.15.42
v5.15.43
v5.15.44
v5.15.45
v5.15.46
v5.15.47
v5.15.48
v5.15.49
v5.15.5
v5.15.50
v5.15.51
v5.15.52
v5.15.53
v5.15.54
v5.15.55
v5.15.56
v5.15.57
v5.15.58
v5.15.59
v5.15.6
v5.15.60
v5.15.61
v5.15.62
v5.15.63
v5.15.64
v5.15.65
v5.15.66
v5.15.67
v5.15.68
v5.15.69
v5.15.7
v5.15.70
v5.15.71
v5.15.72
v5.15.73
v5.15.74
v5.15.75
v5.15.76
v5.15.77
v5.15.78
v5.15.79
v5.15.8
v5.15.80
v5.15.81
v5.15.82
v5.15.83
v5.15.84
v5.15.85
v5.15.86
v5.15.87
v5.15.88
v5.15.89
v5.15.9
v5.15.90
v5.15.91
v5.15.92
v5.15.93
v5.15.94
v5.15.95
v5.15.96
v5.15.97
v5.15.98
v5.15.99
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v5.2
v5.2-rc1
v5.2-rc2
v5.2-rc3
v5.2-rc4
v5.2-rc5
v5.2-rc6
v5.2-rc7
v5.3
v5.3-rc1
v5.3-rc2
v5.3-rc3
v5.3-rc4
v5.3-rc5
v5.3-rc6
v5.3-rc7
v5.3-rc8
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
v5.5-rc6
v5.5-rc7
v5.6
v5.6-rc1
v5.6-rc2
v5.6-rc3
v5.6-rc4
v5.6-rc5
v5.6-rc6
v5.6-rc7
v5.7
v5.7-rc1
v5.7-rc2
v5.7-rc3
v5.7-rc4
v5.7-rc5
v5.7-rc6
v5.7-rc7
v5.8
v5.8-rc1
v5.8-rc2
v5.8-rc3
v5.8-rc4
v5.8-rc5
v5.8-rc6
v5.8-rc7
v5.9
v5.9-rc1
v5.9-rc2
v5.9-rc3
v5.9-rc4
v5.9-rc5
v5.9-rc6
v5.9-rc7
v5.9-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.1.1
v6.1.10
v6.1.11
v6.1.12
v6.1.13
v6.1.14
v6.1.15
v6.1.16
v6.1.17
v6.1.18
v6.1.19
v6.1.2
v6.1.20
v6.1.21
v6.1.22
v6.1.23
v6.1.24
v6.1.25
v6.1.26
v6.1.27
v6.1.28
v6.1.29
v6.1.3
v6.1.30
v6.1.31
v6.1.32
v6.1.33
v6.1.34
v6.1.35
v6.1.36
v6.1.37
v6.1.38
v6.1.39
v6.1.4
v6.1.40
v6.1.41
v6.1.42
v6.1.43
v6.1.44
v6.1.45
v6.1.46
v6.1.47
v6.1.48
v6.1.49
v6.1.5
v6.1.50
v6.1.51
v6.1.52
v6.1.53
v6.1.54
v6.1.55
v6.1.56
v6.1.57
v6.1.58
v6.1.59
v6.1.6
v6.1.60
v6.1.61
v6.1.62
v6.1.63
v6.1.64
v6.1.65
v6.1.66
v6.1.67
v6.1.68
v6.1.69
v6.1.7
v6.1.70
v6.1.71
v6.1.72
v6.1.73
v6.1.74
v6.1.75
v6.1.76
v6.1.77
v6.1.78
v6.1.79
v6.1.8
v6.1.80
v6.1.81
v6.1.82
v6.1.83
v6.1.9
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.3
v6.6.4
v6.6.5
v6.6.6
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.7.1
v6.7.10
v6.7.11
v6.7.2
v6.7.3
v6.7.4
v6.7.5
v6.7.6
v6.7.7
v6.7.8
v6.7.9
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.8.1
v6.8.2
Database specific
{
"vanir_signatures": [
{
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},
"target": {
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"function": "free_swap_and_cache"
}
},
{
"id": "CVE-2024-26960-0421c23b",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39",
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"function": "free_swap_and_cache"
}
},
{
"id": "CVE-2024-26960-105f3e40",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@363d17e7f7907c8e27a9e86968af0eaa2301787b",
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"function": "free_swap_and_cache"
}
},
{
"id": "CVE-2024-26960-1e1b3b76",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d85c11c97ecf92d47a4b29e3faca714dc1f18d0d",
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},
"target": {
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"function": "free_swap_and_cache"
}
},
{
"id": "CVE-2024-26960-4351da71",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d85c11c97ecf92d47a4b29e3faca714dc1f18d0d",
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}
},
{
"id": "CVE-2024-26960-47b36c0c",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a",
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"target": {
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"function": "free_swap_and_cache"
}
},
{
"id": "CVE-2024-26960-6351d78e",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39",
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"target": {
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},
{
"id": "CVE-2024-26960-6dd4f207",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@363d17e7f7907c8e27a9e86968af0eaa2301787b",
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"target": {
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},
{
"id": "CVE-2024-26960-793ccbbb",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@82b1c07a0af603e3c47b906c8e991dc96f01688e",
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"target": {
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"function": "free_swap_and_cache"
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},
{
"id": "CVE-2024-26960-94c0cbba",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1ede7f1d7eed1738d1b9333fd1e152ccb450b86a",
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"target": {
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{
"id": "CVE-2024-26960-9f9f7f3b",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2da5568ee222ce0541bfe446a07998f92ed1643e",
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{
"id": "CVE-2024-26960-b12d837b",
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},
{
"id": "CVE-2024-26960-c9215378",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2da5568ee222ce0541bfe446a07998f92ed1643e",
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{
"id": "CVE-2024-26960-c9c7bfb6",
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]
}
Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced4.11.0Fixed5.10.215
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed5.15.154
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.1.84
- Type
- ECOSYSTEM
- Events
-
Introduced6.2.0Fixed6.6.24
- Type
- ECOSYSTEM
- Events
-
Introduced6.7.0Fixed6.7.12
- Type
- ECOSYSTEM
- Events
-
Introduced6.8.0Fixed6.8.3